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Modem and Router are driving me nuts

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Penth

Senior member
I just got a Motorla Sufboard 5120 that I'm connecting to my Linksys WRT54G wireless router. Every so often the cable connection (comcast) will drop. If I unplug the modem and plug it back in while it is connected to the router, it will never get an IP address. If I unplug it and plug it back in while it is connected directly to my computer, it will get an IP. I can then unplug it from my computer and plug it into the router, and it will give the router an IP. What is going on? More importantly, how can I fix it?
 
Originally posted by: Penth
I just got a Motorla Sufboard 5120 that I'm connecting to my Linksys WRT54G wireless router. Every so often the cable connection (comcast) will drop. If I unplug the modem and plug it back in while it is connected to the router, it will never get an IP address. If I unplug it and plug it back in while it is connected directly to my computer, it will get an IP. I can then unplug it from my computer and plug it into the router, and it will give the router an IP. What is going on? More importantly, how can I fix it?
Click to expand...

Just a guess here, but it may have something to do with the MAC Address' of the router and the PC NIC. Most routers will allow you to "Spoof " the NIC's MAC address in the router, so then the cable service will not see the router as a different entity on the network.

pcgeek11

 
Comcast usually doesn't lock the subscription to the MAC address, but yes it might be that. As mentioned above most modern routers have a setting to change the router's MAC address. You want to change the MAC address of the router to match your computer's MAC address to fool the modem into thinking that it's connected to your computer.

Usually there's a button that "clones" the MAC address of the computer you're using. Otherwise you can look up the MAC address of your NIC manually by right clicking on the Local Area Cconnection icon in Network Connections, select Status, then click on the Support tab and then click the Details button. The "Physical Address" is the MAC address.

Hope this helps...
 
Whenever someone uses the expression "driving me nuts", I get the (mental) image of that pirate with the ship wheel in his pantaloons. :beer:
 
with that router you can go to the basic setup page and go to clone mac address using the computer that the internet connection works with and clone your mac, then your internet should work. no problem. same thing happened to me when i first got cable.
 
I have cloned the mac address and it still gives me the same problem. I will try changing DNNS to 4.2.2.1 if I can find that option.
 
Where do I find DNNS? Did you mean my DNS Servers? I don't think that is the problem. I'm not even being assigned an IP address from the modem.
 
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